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test: wait for multicast filter to bite

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Also, update test description a bit.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2026-02-24 06:59:30 +01:00
parent 2abee79c18
commit e63275d3a1
2 changed files with 31 additions and 29 deletions
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test/case/interfaces/igmp_basic/test.adoc
+13 -2
View File
@@ -4,9 +4,13 @@ ifdef::topdoc[:imagesdir: {topdoc}../../test/case/interfaces/igmp_basic]
==== Description
Verify that all multicast get flooded when no IGMP join exists in the system and
the flooding stops as soon a join arrives
Verify basic IGMP snooping behavior on a bridge. Without any IGMP
membership, multicast should be flooded to all ports. Once a host
joins a group, the bridge should learn the membership via IGMP and
only forward matching multicast to the member port, pruning it from
non-member ports.
....
.1
.---------------------------.
| DUT |
@@ -19,6 +23,13 @@ the flooding stops as soon a join arrives
'-------' '-------' '-------'
.2 .3 .4
HOST
....
A multicast sender on `msend` sends to group 224.1.1.1. First, with
no IGMP joins, verify the group is flooded to both `mrecv` and `!memb`.
Then `mrecv` joins the group and the test waits for the bridge MDB to
reflect the membership before verifying that `!memb` no longer receives
the group.
==== Topology
test/case/interfaces/igmp_basic/test.py
+18 -27
View File
@@ -1,16 +1,13 @@
#!/usr/bin/env python3
#
# Add join the group 224.1.1.1 from data1 on the host. Send to that
# group from `msend`, verify that `mrecv` receives it and that `!memb`
# does not.
#
"""IGMP basic
"""
IGMP basic
Verify that all multicast get flooded when no IGMP join exists in the system and
the flooding stops as soon a join arrives
Verify basic IGMP snooping behavior on a bridge. Without any IGMP
membership, multicast should be flooded to all ports. Once a host
joins a group, the bridge should learn the membership via IGMP and
only forward matching multicast to the member port, pruning it from
non-member ports.
....
.1
.---------------------------.
| DUT |
@@ -23,12 +20,20 @@ the flooding stops as soon a join arrives
'-------' '-------' '-------'
.2 .3 .4
HOST
....
A multicast sender on `msend` sends to group 224.1.1.1. First, with
no IGMP joins, verify the group is flooded to both `mrecv` and `!memb`.
Then `mrecv` joins the group and the test waits for the bridge MDB to
reflect the membership before verifying that `!memb` no longer receives
the group.
"""
import infamy
import time
import infamy.iface as iface
import infamy.multicast as mcast
from infamy.util import until
query_interval = 4
@@ -118,21 +123,7 @@ with infamy.Test() as test:
receive_ns.must_receive("ip dst 224.1.1.1")
with test.step("Verify that the group 224.1.1.1 is no longer received on host:data3"):
attempt = 0
# This retry loop exists to handle the case where the first query is lost due
# to the network just starting up. In particular there's a case where a newly
# created bridge uses the "NOOP" scheduler (noop_enqueue()) for a split second
# while it's starting up, which might drop the first query msg.
while attempt <= query_interval:
try:
nojoin_ns.must_not_receive("ip dst 224.1.1.1")
break
except Exception as e:
attempt += 1
if attempt > query_interval:
test.fail()
else:
print(f"Got mcast flood, retrying ({attempt}/{query_interval})")
until(lambda: iface.exist_bridge_multicast_filter(target, "224.1.1.1", mreceive, "br0"), attempts=10)
nojoin_ns.must_not_receive("ip dst 224.1.1.1")
test.succeed()